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Wow, I didn't know that roundabouts are more efficient than other intersection types. That's really cool. (Now I want to build a traffic simulator that can simu

Wow, I didn't know that roundabouts are more efficient than other intersection types. That's really cool. (Now I want to build a traffic simulator that can simulate that effect...)

rbritton 16y ago
There's a roundabout by my business that they put in about two years ago. There's also a large trucking hub that has to go through it to access the interstate. Whoever designed it didn't consider this factor when putting it in, so it's too small for a semi truck to make it through. They just drive over the center.
- pbhjpbhj 16y ago
  In the UK we often have smaller roundabouts, called "mini-roundabouts", they're designed with a small hump of circular horizontal cross-section that can easily be driven over by large vehicles. It's part of the design that trailer towing vehicles or wide vehicles can simply drive over the top if necessary.
JoeAltmaier 16y ago
Hm. We have one in town - 3 roads, 2 lanes, one of which doesn't go all the way around. A "map" posted 100 yards in front listing all the options. I've seen people stop to look at the map before going on. This is not more efficient.
- nitrogen 16y ago
  Take down the map and it probably would be. We had an intersection in my city with three roads/six entrances. Originally it was a 6-way stop, but it had very poor visibility and there were numerous accidents. Now, it's a roundabout, and traffic flows much more smoothly (I've never seen more than three cars waiting to enter, and it usually takes about 5-10 seconds per car). Multi-lane roundabouts are probably more confusing than single-lane, as well, but if the street is primarily traveled by locals, give them some time to learn it and speed should pick back up.